* {
  margin: 0;
  padding: 0;
}

div {
  width: 380px;
  height: 300px;
  margin: 100px auto;
  background: #E4E7ED;
  display: none;
  position: relative;
  font-size: 20px;
  font-family: '楷体';
}

ul>li {
  list-style: none;
}

ul {
  width: cacl(100% - 40px);
  height: 250px;
  padding: 20px;
}

li {
  height: 40px;
  line-height: 40px;
  margin: 10px 0;
}

li>input {
  width: 250px;
  height: 30px;
  text-align: center;
  line-height: 30px;
}

li>lable {
  display: inline-block;
  margin-right: 10px;
}

.header {
  width: cacl(100% - 40px);
  height: 50px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: black;
  color: white;
  padding: 0 20px;
}

.header>span {
  cursor: pointer;
  transition: all .6s;
}

.header>span:hover {
  color: red;
}

.btn,
.btn1 {
  display: inline-block;
  width: 100px;
  height: 40px;
  text-align: center;
  line-height: 40px;
  border: none;
  text-align: center;
  line-height: 40px;
  background-color: dodgerblue;
  color: white;
  cursor: pointer;
  transition: all .6s;
  margin: 50px;
}

.btn:hover,
.btn1:hover {
  background: deepskyblue;
}

.btn1 {
  margin: 0;
  padding: 0;
  width: 60px;
  height: 30px;
  text-align: center;
  line-height: 30px;
  margin-left: 25px;
}

li:nth-child(4) {
  display: flex;
  align-items: center;
  justify-content: space-around;
}